Finding the Fourth Proportional to 31,120.98, 42,945.24 and 17,690.34

Step by Step Solution

1. Step 1: Write the proportion equation
   31,120.98 : 42,945.24 = 17,690.34 : x
2. Step 2: Convert to fraction form
   31,120.98/42,945.24 = 17,690.34/x
3. Step 3: Cross multiply
   31,120.98x = 42,945.24 × 17,690.34
4. Step 4: Simplify right side
   31,120.98x = 759,715,896.98
5. Step 5: Solve for x
   x = 759,715,896.98/31,120.98
6. Step 6: Final answer
   x = 24,411.70